If you are looking for just an approximate sync (which Mosaic seems to be about), then, of course, MTC should be enough for semi-pro installations.
Yet, for professional A/V syncing you will still need a SyncStation, to guarantee sample-exact sync (so that timecode is broadcasted on the very same sample and video frame border every time you start playback). Then RS-422 is still unbeatable when it comes to routing over long distances and interoperability with video devices.
Maybe we’ll see future IP-based syncing solutions, which will cover both control and cost expectations, e.g. AES-70 / OCA.
May I point you to another issue I have with the SyncStation:
Do you experience the same?
Thanks, Andreas